chore(deps): update dependency @types/node to v9.6.4

Author: renovate-bot

package.json

@@ -22,7 +22,7 @@
   },
   "devDependencies": {
     "@types/graphql": "0.13.0",
-    "@types/node": "9.6.3",
+    "@types/node": "9.6.4",
     "typescript": "2.8.1"
   },
   "repository": {

yarn.lock

@@ -6,9 +6,9 @@
   version "0.13.0"
   resolved "https://registry.yarnpkg.com/@types/graphql/-/graphql-0.13.0.tgz#78a33a7f429a06a64714817d9130d578e0f35ecb"
 
-"@types/node@9.6.3":
-  version "9.6.3"
-  resolved "https://registry.yarnpkg.com/@types/node/-/node-9.6.3.tgz#f5fd440f8a9867b65ae76d442e269622a1db00b5"
+"@types/node@9.6.4":
+  version "9.6.4"
+  resolved "https://registry.yarnpkg.com/@types/node/-/node-9.6.4.tgz#0ef7b4cfc3499881c81e0ea1ce61a23f6f4f5b42"
 
 "@types/node@^9.4.6":
   version "9.4.6"